docs: remove Composer v1 instructions

Author: gabe565

README.md

@@ -6,16 +6,10 @@ An enhanced version of the default [PHP Docker image](https://hub.docker.com/_/p
 
 ## Pull Command
 
-The following command will retrieve an image with PHP 8.1 and Composer v2:
+The following command will retrieve an image with PHP 8.5 and Composer v2:
 
 ```sh
-docker pull ghcr.io/clevyr/php:8.1
-```
-
-Alternative tags exist with Composer v1. If your application still requires Composer v1, you may add the version to the end of the tag:
-
-```sh
-docker pull ghcr.io/clevyr/php:8.1-composer1
+docker pull ghcr.io/clevyr/php:8.5
 ```
 
 ## Runtime Configuration